Thesunkenpuppetlinesatthecornersofthemoutharethetwolinesextendingdownwardfrombothsidesofthecornersofthemouth,justlikethegapattheopeningandclosingofthemouthofamarionette,alsoknownasbracketlines.Likeotherwrinkles,itiscausedbyproteinloss,softtissuevolumeshrinkage,lossofsupport,anddecreasedelasticityofthedermis.Butnomatterwhatthereasonis,itsappearancewillmakepeoplelookoldandhaggard.Thesunkencornersofthemouthareparticularlyaging.Afterstripping,thisproblemhasbeenimprovedandsolved~ .